Blast-furnace.



No. 718,945. PATENTED JAN. 20, 1903.- L. BENTLEY.

BLAST FURNACE.

APPLIOATION FILED SEPT. 9, 1902.

no 110mm.

M A Tron/vim IINTTEE STATES PATENT OFFICE.

LINN BENTLEY, OF COLUMBUS, OHIO, ASSIGNOR OF ONE-HALF TO LOUIS F. FIESER, OF COLUMBUS, OHIO.

BLAST-Fl) RNACE.

sPECIFICATION formingpart of Letters Patent No. 718,945, dated January 20, 1903.

Application filed September 9, 1902. Serial No. 122,651. (No mode?) To all, whom it may concern: may be detained and removed, all as herein- Be it known that I, LINN BENTLEY, a oitiafter particularly set forth and claimed. zen of the United States, residing at Oolum- In the accompanying drawings, showing bus, in the county of Franklin and State of one embodiment of the invention, Figure 1 Ohio, have invented certain new and useful is a central vertical sectional view. Fig. 2

Improvements in Blast-Furnaces; and I do is a plan of the dust-trap from the plane 00 m, herebydeclare thefollowing tobea full,clear, Fig. 1; and Fig. 3 is a horizontal sectional and exact description of the invention, such view on the line 1 y, Fig. 1, looking down. as will enable others skilledin the art to which 1 designates the blast-furnace, which is of 10 it appertains to make and use the same. any ordinary construction and need not be In most iron ores there is a considerable described in detail.

quantity of fine dust or particles of ore 2 designates the flue for carrying off the deemed to contain the best and purer metal, gases and has commonly been called the and heretofore in the process of reducing ore downtake. Instead of carrying the flue 15 in a blast-furnace a large proportion of this downward from the top of the furnace I produst has been blown out through the downpose to first build'it upward, as indicated at take, accumulating in and choking the does 2, and then downward. In this upwardlyto such an extent that it has been necessary leading portion 2 I construct projections or to shut down the furnace at frequent interbaffles 2", preferably having their upper sides 20 vals to remove the accumulation. This acinclined, as indicated at 2"", so that particles cumlation is often lost or wasted, because droppingor lodging thereon shall tend to roll when it is added to a charge the ordinary off and fall back into the furnace. quantity of dust is augmented and the trouble 3 designates a valved vent or bleeder to let in the fines aggravated. out gas should the pressure become too high 25 The object of my invention therefore is to for safety. This bleeder I locate above the 7 provide an improved construction of. gas-flue upwardly-leading part of the downtake, so or downtake that will prevent to a great exthat particles of dust entering or lodging tent, if not entirely, the escape of the ore partherein shall fall back into the flue and furticles through the downtake. nace.

0 In my improvements the downtake leads The dust-trap comprises a chamber 4, into first upward from the top of the furnace and which the upper end of the downtake disthen downward, so that there shall be a tendcharges, the discharging end of the downtake ency of the ore particles to fall by their own being shown to be somewhat enlarged, but of weight back into the furnace, where they will smaller diameter than the diameter of cham- 5 be reduced along with the rest of the charge. her 4, so that the branch flues 2 2, forming The invention also consistsin providing the a continuation of the downtake, can lead upupwardly-leading part of the downtake-liue ward out of the upper end of the chamber 4. with substantially horizontally-extending ob- Thus it will be observed that the discharging structions or baffles, against which the ore end of the flue 2 is practically in the same 40 particles strike and are deprived of their mohorizontal plane as the induction'end of the mentum. The invention also consistsin proflues 2 2, and particles dropping into the 'viding a bleeder directly above and in line trap 4 can hardly be carried upward through with the axis of the upwardly-directed part the i'lues 2 2. The lower end of the dustof the downtake, so that the ore particles ristrap is provided with a bell-valve 4 which 5 ing in it will fall back into the furnace may be operated at any time to discharge the 5 through the said upwardly-leading portion. accumulation in the trap. The lines 2 2 The invention further consists in a peculcommunicate or discharge into the ground iar construction of dust -catcher whereby or other flues 2, and the gases from the furmost of the metallic and otherdust that does nace may be conveyed to any place where it 50 get around the bend in the top of the flue maybe desired to utilize themfor example,

as fuel for stoves or boilers. The fine 2 can also be provided with a safety-valve 5 to give vent in case of explosion in that part of the downtake. With this construction it will be observed that the valuable metallic dust which has heretofore been wasted is saved and much annoyance and loss of time due to choking of fines avoided.

What I claim, and desire to secure by Letters Patent, is

1. In a blast-furnace, a downtake, an upwardly-leading portion therein, and horizontally-extending projections on the inner side of said upwardly-leading portion to obstruct the passage of the dust particles through said upwardly-leading portion.

2. In a blast-furnace, a downtake, an upwardly-leading portion therein and dust-0bstructing projections on the inner side of saidnpWardly-leading portion having inwardlyinclined upper sides and horizontal lower sides.

3. In a blast-furnace, the combination of a downtake, a dust-trap connected therewith comprising a cylindrical portion of greater diameter than the inlet of the downtake thereto, and outlet-fiues from the top of said cylindrical portion having their outlet ends lying in substantially the same horizontal plane as the inlet end of the downtake.

4. In a blast-furnace, a downtake, an upwardly-leading portion therein having interior projections or'dust-baffles, a dust-trap in said downtake, and outlets from said dusttrap having their terminals lying in substantially the same horizontal plane as the inlet from the downtake.

5. In a blast-furnace, a downtake, an up wardly-leading portion therein provided with dust-obstructing projections, and a bleeder or explosion-valve located in line with the axis of said upwardly-leading portion.

In testimony whereof I affix my signature in presence of two witnesses.

LINN BENTLEY.

Witnesses:

MERRILL U. RIcKETTs, GEO. M. FINOKEL. 

